This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker ... (Read 57 times)

fnuegbu

  • Hero Member
  • *****
  • Posts: 539
on: Jun 25, 2018
A 50-year-old received trauma to the chest that caused severe impairment of the primary pace-maker cells of the heart. Which of the following areas received the greatest damage?
 
  a. Atrioventricular (AV) node
  b. Sinoatrial (SA) node
  c. Bundle of His
  d. Ventricles

Question 2

A 28-year-old with seizure disorder has a vagus nerve stimulator implanted to help control sei-zure activity. Which result will the nurse expect to occur?
 
  a. Increased speed of cardiac cycle
  b. Increased cardiac contractility
  c. Decreased vasodilation
  d. Decreased cardiac conduction


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

Dominic

  • Sr. Member
  • ****
  • Posts: 328
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: B
The SA node, not the AV node, is considered the pacemaker of the heart. Neither the bundle of His nor the ventricles are involved.

Answer to Question 2

ANS: D
The vagus nerve releases acetylcholine. Acetylcholine causes decreased heart rate and slows conduction through the AV node, thus decreasing the speed of the cardiac cycle. This reaction also decreases contractility but does not cause decreased vasodilation.


fnuegbu

  • Member
  • Posts: 539
Reply 2 on: Jun 25, 2018
:D TYSM

apple

  • Member
  • Posts: 352
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Everyone has one nostril that is larger than the other.

Did you know?

Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

Did you know?

Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

Did you know?

The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

Mutations caused by air pollution. Mutations caused by air pollution.
Thinning of eggshells caused by DDT. Thinning of eggshells caused by DDT.
Placenta previa. The condition is caused by the development of the placenta over the cervical canal, Placenta previa. The condition is caused by the development of the placenta over the cervical canal,
Steric effects caused by ligand binding to the heme of myoglobin Steric effects caused by ligand binding to the heme of myoglobin
Spinal changes caused by osteoporosis. Spinal changes caused by osteoporosis.
Primary Visual Cortex Primary Visual Cortex
Video: The Pressure Flow Model in a Plant

For a complete list of videos, visit our video library